Moneybird

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Turn overdue Moneybird invoices into a real letter. The join is n8n, Make or Zapier: your books stay in charge, we print and post. There is no inbound webhook here that sends a letter by itself - that would post other people’s mail on your account.

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Was Sie damit tun können

A reminder or formal notice by post, with an idempotency key per invoice number so a retry is not a second letter.
Registered mail for large amounts, ordinary post otherwise. The price comes from our API, not from a guess in the workflow.
Status back into Moneybird through our signed webhooks (posted, delivered).

Verbinden

Create a live API key in your SendLetter account, preferably on the organisation so it survives a staff change.
In n8n (or Make/Zapier): trigger on unpaid Moneybird invoices older than 14 days that have a postal address.
Call POST /api/v1/letters with the letter body, the address, and Idempotency-Key dunning-moneybird-INVOICE-step1.
Point the SendLetter webhook for letter.posted at a note on the invoice. Without that, Moneybird never learns the letter went out.

We never auto-send from a Moneybird webhook on our servers. Your workflow chooses which invoice becomes a letter. Start on sk_test_ until the mapping is right.

API documentation